The red sequence of Abell X-ray underluminous clusters - Trejo-Alonso, J. J; Caretta, C. A; Laganá, T. F; Sodré Júnior, Laerte; Cypriano, Eduardo Serra; Lima Neto, Gastão César Bierrenbach; Oliveira, Cláudia Lúcia Mendes de (Latin American Regional IAU Meeting, 2013)